Speaker
Description
Understanding the nature of exotic hadrons and the internal structure of near-threshold states remains a major challenge in quantum chromodynamics (QCD). We developed a unified framework combining the Godfrey-Isgur relativized quark model, Hamiltonian effective field theory, and finite-volume lattice QCD inputs to systematically study the properties of both conventional and exotic charmed-strange and hidden-charm states.
Using this approach, we reexamined the long-standing puzzle of the Ds0(2317) and Ds1(2460) mesons. Our analysis reveals that these states receive significant coupled-channel effects from D()K interactions, leading to large mass shifts from their bare c\bar{s} cores. The resulting pole masses and compositeness coefficients are in good agreement with lattice QCD data and experimental measurements, indicating a mixed nature with both compact c\bar{s} and molecular D()K components. In contrast, the higher Ds1(2536) and Ds2(2573) states remain predominantly conventional c\bar{s} mesons. In addition, we also study the decay of Ds1(2460) and Ds1(2536) to Ds\pi\pi, where an exotic candidate state Tcs was discovered. These findings highlight the importance of coupled-channel and core-molecule mixing effects in understanding the spectrum of QCD.
